package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * 分类的业务逻辑层
 */
@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    private DishService dishService;

    @Autowired
    private SetmealService setmealService;

    /**
     * 根据id删除分类 删除前需要进行判断是否关联了菜品和套餐
     * @param id
     */
    @Override
    public void remove(Long id) {
        //因为你传输过来的id可能关联了菜品或套餐 所以我们都需要查询
        //1.先判断是否关联了菜品 如果关联了 抛出异常 不删除
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        dishLambdaQueryWrapper.eq(Dish::getCategoryId, id);
        int count = dishService.count(dishLambdaQueryWrapper);
        if (count > 0){
            throw new CustomException("当前分类关联了菜品 不能删除");
        }
        //2.没有关联菜品就查询是否关联了套餐 如果关联了 抛出异常 不删除
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId, id);
        int count1 = setmealService.count(setmealLambdaQueryWrapper);
        if (count1 > 0){
            throw new CustomException("当前分类关联了套餐 不能删除");
        }
        //3.如果都没有关联 那就删除
        this.removeById(id);
    }
}
